Mxsmanic wrote in
news
Jay Maynard writes:

With all that said, a fuel-efficient aircraft engine is a Good Idea,
not because of global warming (boy, have we had to shovel a lot of
that out of our driveway this winter!), but simply because it's less
expensive to operate. In aviation, that's always desirable. It's one
reason I'm even looking at a Rotax-powered aircraft, despite my
lingering misgivings about having an engine my local mechanic can't
fix.

So why are the vast majority of small aircraft powered by engines that
were designed during the Second World War at the latest?


They aren['t


Bertie